Apparatus for drying or conditioning laundry goods and the like in batches



Jan. 11, 1966 F. MAGNUSSON 3,228,117

APPARATUS FOR DRYING QR CONDITIONING LAUNDRY GOODS AND THE LIKE IN BATCHES Filed Sept. 19. 1961 FIGZ.

FIGI.

INVENTORI FOLKE MAGNUS SON wdon/g, 79W

ATTYS.

United States Patent 3,228,117 APPARATUS FOR DRYING 0R CONDITIONING LAUNDRY GGODS AND THE LIKE IN BATCHES Folire Magnusson, Stockholm, Sweden, assignor to Al-rtiebolaget Svenska Flaktfahriiren, Stockhoim, Sweden Filed Sept. 19, 1961, Ser. No. 139,310 2 Claims. (Cl. 34-126) The present invention relates to an apparatus for drying or conditioning laundry goods and the like in batches, comprising a perforated cylindrical drum rotatably journalled Within a stationary casing and provided with lifting means secured to the inner periphery of the drum, and means to condition and circulate a gaseous treating medium through the drum substantially in a vertical direction. There are two types of drying drums for laundry goods, namely such for a continuous treatment and such for treatment in batches. However, there are no dryers suited for both types of treatment. The continuous drying drum is very well suited for the treatment of laundry goods of one and the same kind but such a dryer is not entirely satisfactory where laundry goods of different kinds are intermixed. In the latter, case it has proved necessary to use drying drums designed for treatment in batches. Drying drums of this type, which hitherto have been obtainable in the market, have without exception been designed to be fed and discharged at one and the same end. This is, however, a great drawback as an orderly transport of the goods through the laundry cannot be obtained. The drying drum according to the invention is an improved design for drying drums for treatment in batches and has been constructed to be incorporated into highly mechanized laundries.

The apparatus according to the invention is characterized in that the two end walls of the drum are provided with concentrically arranged openings, in front of which there are arranged shutable doors in the casing, for the introduction and discharge of the goods to be treated, and in that the apparatus is supported on a base-framework, which at the feeding end of the drum is supported on a pivot axis and at the opposite end of the drum is arranged to be lowered and raised by means of a quickhoisting means in order to facilitate a rapid discharge of the batch.

The hoisting means may suitably consist of one or more hydraulic or pneumatic pistons.

The invention will now be described more in detail with reference to the accompanying drawing, wherein FIG. 1 shows a longitudinal cross-section of a drying drum according to the invention, and

FIG. 2 shows a cross-section of same along the line 2-2 in FIG. 1.

In the drawing 1 designates a drum rotatably journalled within a stationary casing 2, the perforated cylindrical wall of said drum being designated 10. 11 designates lifting means secured to the inner periphery of the drum to tumble the goods. 3 stands for a base-framework, on which the apparatus is supported, and 4 designates a hoisting means, which in the illustrated embodiment consists of hydraulic pistons. 3a designates a pivot axis for the base-framework at the feeding end of the drum. 5 designates a heating element and 6 a ventilator for recirculation of a gaseous treating medium. 7 stands for a return duct for the drying medium which has passed through the drum and is caused to pass a filter 8. 9 designates a damper-regulated inlet for room air which is mixed with the air being recirculated through the duct 7. A quantity of the drying medium corresponding to the quantity of the introduced room air is caused to be exhausted through the duct 90. 12 and 13 respectively des- 3,228,117 Patented Jan. 11, 1966 ignate two concentric openings at the feeding end and the discharge end respectively of the drying drum. In the casing 2 there are shutable doors 14 and 10 respectively arranged in front of said openings for the supply and discharge respectively of the drying goods. The drying goods are supplied to the drum by means of a conveyor 15.

In order to eifcctively unfold and shake out the drying goods during the tumbling treatment, the diameter of the drying drum should suitably be large in relation to the length of the drum, which in its turn suitably is chosen in such a manner that the drying drum for drying in batches with a proper load will accommodate the contents of the laundry extractor associated with the dryer. The advantage of such an arrangement is that the extractor can be entirely emptied and immediately be used for the next batch.

When the drying drum is used for a treatment in batches of laundry goods-this being the main field of use for the drying drumthe doors 14 and 10 are closed and the drying drum rotates with its axis in a horizontal position. For facilitating a rapid emptying the drying drum, the hydraulic pistons 4 rapidly lower the drum to a suitable declination so that the laundry goods after treatment can be rapidly and easily discharged from the drying drum. It is also possible to use the apparatus as a conventional drying drum for a continuous treatment of laundry goods by adjusting the drying drum to a suitable declination towards the discharge end. In this case the doors 14 and 10 are open. In a continuous treatment the treatment time can be adjusted to suit different kinds of drying goods by varying the declination.

What I claim is:

1. Apparatus for drying or conditioning laundry goods or the like in batches, comprising a stationary casing, a perforated cylindrical drum having spaced end walls, said drum rotatably mounted in said casing and provided with lifting means secured to the inner periphery of the drum intermediate said end walls, means to condition and circulate a gaseous treating medium through the drum substantially in a vertical direction, means defining concentrically-arranged openings in said end walls, shutable doors in the casing in registry with said openings for the introduction and discharge of the goods to be treated, and a base framework having a pivot axis supporting said apparatus at the feeding end of the drum and quick-hoisting means supporting said apparatus at the opposite end of the drum with the drum axis substantially horizontal during treatment of said goods and operable upon completion of treatment to lower the discharge end in order to facilitate a rapid discharge of the batch.

2. Apparatus according to claim 1 characterized in that the hoisting means consists of at least one fluid-operated piston.

References tilted by the Examiner UNITED STATES PATENTS 1,720,537 7/1929 Barthel 34133 2,041,318 5/1936 Berger 34-108 2,543,579 2/1951 Kauffmann 34133 2,627,668 2/1953 Handwerk 3433 2,802,283 8/1957 Strike 34-133 2,959,048 11/1960 Ellis 34126 3,020,648 2/1962 Strike 34-133 WILLIAM F. ODEA, Primary Examiner.

CHARLES E. OCONNELL, NORMAN YUDKOFF,

Examiners.

I. A. LEPPINK, C. R. REMKE, Assistant Examiners. 

1. APPARATUS FOR DRYING OR CONDITIONING LAUNDRY GOODS OR THE LIKE IN BATCHES, COMPRISING A STATIONARY CASING, A PERFORATED CYLINDRICAL DRUM HAVING SPACED END WALLS, SAID DRUM ROTATABLY MOUNTED IN SAID CASING AND PROVIDED WITH LIFTING MEANS SECURED TO THE INNER PERIPHERY OF THE DRUM INTERMEDIATE SAID END WALLS, MEANS TO CONDITION AND CIRCULATE A GASEOUS TREATING MEDIUM THROUGH THE DRUM SUBSTANTIALLY IN A VERTICAL DIRECTION, MEANS DEFINING CONCERNTRICALLY-ARRANGED OPENINGS IN SAID END WALLS, SHUTABLE DOORS IN THE CASING IN REGISTRY WITH SAID OPENINGS FOR THE INTRODUCTION AND DISCHARGE OF THE GOODS TO BE TREATED, AND A BASE FRAMEWORK HAVING A PIVOT AXIS SUPPORTING SAID AP- 